Basketball backboard support arm



FIG. 1 is a perspective view showing our new design for a basketball backboard support arm in association with a basketball goal;

FIG. 2 is an enlarged scale perspective view showing the basketball backboard support arm separately from the basketball goal;

FIG. 3 is a right side view thereof.

FIG. 4 is a left side view thereof.

FIG. 5 is a lower end view thereof.

FIG. 6 is an upper end view thereof.

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The broken lines showing the basketball goal are for illustrative purposes only, and form no part of the claimed design. 

CLAIM The ornamental design for a basketball backboard support arm, as shown and described. 